article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
	display: block;
}

audio,
canvas,
video {
	display: inline-block;
}

audio:not([controls]) {
	display: none;
	height: 0;
}

html {
	font-family: sans-serif;
	-webkit-text-size-adjust: 100%;
}

body {
	font-family: 'Helvetica Neue', Helvetica, Arial, Sans-serif;
	background: #fff;
	padding-top: 0;
	margin: 0;
}

a:focus {
	outline: thin dotted;
}

a:active,
a:hover {
	outline: 0;
}

h1 {
	margin: .67em 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	font-size: 16px;
}

abbr[title] {
	border-bottom: 1px dotted;
}

hr {
	box-sizing: content-box;
	height: 0;
}

mark {
	background: #ff0;
	color: #000;
}

code,
kbd,
pre,
samp {
	font-family: monospace, serif;
	font-size: 1em;
}

pre {
	white-space: pre-wrap;
}

q {
	quotes: \201C\201D\2018\2019;
}

small {
	font-size: 80%;
}

sub,
sup {
	font-size: 75%;
	line-height: 0;
	position: relative;
	vertical-align: baseline;
}

sup {
	top: -0.5em;
}

sub {
	bottom: -0.25em;
}

img {
	border: 0;
	vertical-align: middle;
	color: transparent;
	font-size: 0;
}

svg:not(:root) {
	overflow: hidden;
}

figure {
	margin: 0;
}

fieldset {
	border: 1px solid silver;
	margin: 0 2px;
	padding: .35em .625em .75em;
}

legend {
	border: 0;
	padding: 0;
}

table {
	border-collapse: collapse;
	border-spacing: 0;
	overflow: hidden;
}

a {
	text-decoration: none;
}

blockquote {
	border-left: 3px solid #D0E5F2;
	font-style: normal;
	display: block;
	vertical-align: baseline;
	font-size: 100%;
	margin: .5em 0;
	padding: 0 0 0 1em;
}

ul,
ol {
	padding-left: 20px;
}

.main-wrap {
	max-width: 100%;
	min-width: 300px;
	margin: 0 auto;
}

.content-wrap {
	overflow: hidden;
	background-color: #f9f9f9;
}

.content-wrap a {
	word-break: break-all;
}

.headline {
	border-bottom: 4px solid #f6f6f6;
}

.headline-title.onlyheading {
	margin: 20px 0;
}

.headline img {
	max-width: 100%;
	vertical-align: top;
}

.headline-background-link {
	line-height: 2em;
	position: relative;
	display: block;
	padding: 20px 45px 20px 20px !important;
}

.icon-arrow-right {
	position: absolute;
	top: 50%;
	right: 20px;
	background-image: url(http://static.daily.zhihu.com/img/share-icons.png);
	background-repeat: no-repeat;
	display: inline-block;
	vertical-align: middle;
	background-position: -70px -20px;
	width: 10px;
	height: 15px;
	margin-top: -7.5px;
}

.headline-background .heading {
	color: #999;
	font-size: 15px!important;
	margin-bottom: 8px;
	line-height: 1em;
}

.headline-background .heading-content {
	color: #444;
	font-size: 17px!important;
	line-height: 1.2em;
}

.headline-title {
	line-height: 1.2em;
	color: #000;
	font-size: 22px;
	margin: 20px 0 10px;
	padding: 0 20px!important;
	font-weight: bold;
}

.meta {
	white-space: nowrap;
	text-overflow: ellipsis;
	overflow: hidden;
	font-size: 16px;
	color: #b8b8b8;
}

.meta .source-icon {
	width: 20px;
	height: 20px;
	margin-right: 4px;
}

.meta .time {
	float: right;
	margin-top: 2px;
}

.content {
	color: #444;
	line-height: 1.6em;
	font-size: 17px;
	margin: 10px 0 20px;
}

.content img {
	max-width: 100%;
	display: block;
	margin: 30px auto;
}

.content img+img {
	margin-top: 15px;
}

.content img[src*="zhihu.com/equation"] {
	display: inline-block;
	margin: 0 3px;
}

.content a {
	color: #259;
}

.content a:hover {
	text-decoration: underline;
}

.view-more {
	margin-bottom: 25px;
	text-align: center;
}

.view-more a {
	font-size: 16px;
	display: inline-block;
	width: 125px;
	height: 30px;
	line-height: 30px;
	background: #f0f0f0;
	color: #B8B8B8;
}

.question {
	overflow: hidden;
	padding: 0 20px!important;
}

.question+.question {
	border-top: 5px solid #f6f6f6;
}

.question-title {
	line-height: 1.4em;
	color: #000;
	font-weight: 700;
	font-size: 18px;
	margin: 20px 0;
}

.meta .author {
	color: #444;
	font-weight: 700;
}

.answer+.answer {
	border-top: 2px solid #f6f6f6;
	padding-top: 20px;
}

.footer {
	text-align: center;
	color: #b8b8b8;
	font-size: 13px;
	padding: 20px 0;
}

.footer a {
	color: #b8b8b8;
}

.question .view-more a {
	width: 100%;
	display: block;
}

.hot-comment {
	-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

.comment-label {
	font-size: 16px;
	color: #333;
	line-height: 1.5em;
	font-weight: 700;
	border-top: 1px solid #eee;
	border-bottom: 1px solid #eee;
	margin: 0;
	padding: 9px 20px;
}

.comment-list {
	margin-bottom: 20px;
}

.comment-item {
	font-size: 15px;
	color: #666;
	border-bottom: 1px solid #eee;
	padding: 15px 20px;
}

.comment-meta {
	position: relative;
	margin-bottom: 10px;
}

.comment-meta .author {
	vertical-align: middle;
	color: #444;
}

.comment-meta .vote {
	position: absolute;
	color: #b8b8b8;
	font-size: 12px;
	right: 0;
}

.night .comment-label {
	color: #b8b8b8;
	border-top: 1px solid #303030;
	border-bottom: 1px solid #303030;
}

.night .comment-item {
	color: #7f7f7f;
	border-bottom: 1px solid #303030;
}

.icon-vote,
.icon-voted {
	background-repeat: no-repeat;
	display: inline-block;
	vertical-align: 0;
	width: 11px;
	height: 12px;
	margin-right: 4px;
	background-image: url(http://static.daily.zhihu.com/img/app/Comment_Vote.png) !important;
}

.icon-voted {
	background-image: url(http://static.daily.zhihu.com/img/app/Comment_Voted.png) !important;
}

.night .icon-vote {
	background-image: url(http://static.daily.zhihu.com/img/app/Dark_Comment_Vote.png) !important;
}

.img-wrap .headline-title {
	bottom: 5px;
}

.img-wrap .img-source {
	right: 10px!important;
	font-size: 9px;
}

.global-header {
	position: static;
}

.button {
	width: 60px;
}

.button i {
	margin-right: 0;
}

.headline .img-place-holder {
	height: 200px;
}

.from-column {
	width: 280px;
	line-height: 30px;
	height: 30px;
	padding-left: 90px;
	color: #2aacec;
	background-image: url(http://static.daily.zhihu.com/img/News_Column_Entrance.png);
	box-sizing: border-box;
	margin: 0 20px 20px;
}

.from-column:active {
	background-image: url(http://static.daily.zhihu.com/img/News_Column_Entrance_Highlight.png);
}

.night .headline {
	border-bottom: 4px solid #303030;
}

.night img {
	-webkit-mask-image: -webkit-gradient(linear, 0 0, 0 100%, from(rgba(0, 0, 0, 0.7)), to(rgba(0, 0, 0, 0.7)));
}

body.night,
.night .content-wrap {
	background: #343434;
}

.night .answer+.answer {
	border-top: 2px solid #303030;
}

.night .question+.question {
	border-top: 4px solid #303030;
}

.night .view-more a {
	background: #292929;
	color: #666;
}

.night .icon-arrow-right {
	background-image: url(http://static.daily.zhihu.com/img/share-icons.png);
	background-repeat: no-repeat;
	display: inline-block;
	vertical-align: middle;
	background-position: -70px -35px;
	width: 10px;
	height: 15px;
}

.night blockquote,
.night sup {
	border-left: 3px solid #666;
}

.night .content a {
	color: #698ebf;
}

.night .from-column {
	color: #2b82ac;
	background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance.png);
}

.night .from-column:active {
	background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance_Highlight.png);
}

.large .question-title {
	font-size: 24px;
}

.large .meta {
	font-size: 18px;
}

.large .content {
	font-size: 20px;
}

.large blockquote,
.large sup {
	line-height: 1.6;
}

.meta .meta-item {
	-o-text-overflow: ellipsis;
	width: 39%;
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	display: inline-block;
	color: #929292;
	margin-right: 7px;
}

.headline .meta {
	white-space: nowrap;
	text-overflow: ellipsis;
	overflow: hidden;
	font-size: 11px;
	color: #b8b8b8;
	margin: 15px 0;
	padding: 0 20px;
}

.headline .meta a,
.headline .meta a:hover {
	padding-left: 1em;
	margin-top: 2px;
	float: right;
	font-size: 11px;
	color: #0066cf;
	text-decoration: none;
}

.highlight {
	width: auto;
	overflow: auto;
	word-wrap: normal;
}

.highlight::-webkit-scrollbar {
	width: 6px;
	height: 6px;
}

.highlight code {
	overflow: auto;
}

.highlight::-webkit-scrollbar-thumb:horizontal {
	border-radius: 6px;
	background-color: rgba(0, 0, 0, .5);
}

.highlight::-webkit-scrollbar-thumb:horizontal:hover {
	background-color: rgba(0, 0, 0, .6);
}

.highlight pre {
	margin: 0;
	white-space: pre;
}

.highlight .hll {
	background-color: #ffc;
}

.highlight .err {
	color: #a61717;
	background-color: #e3d2d2;
}

.highlight .cp {
	color: #999;
	font-weight: 700;
}

.highlight .cs {
	color: #999;
	font-weight: 700;
	font-style: italic;
}

.highlight .gd {
	color: #000;
	background-color: #fdd;
}

.highlight .gi {
	color: #000;
	background-color: #dfd;
}

.highlight .gu {
	color: #aaa;
}

.highlight .ni {
	color: purple;
}

.highlight .nt {
	color: navy;
}

.highlight .w {
	color: #bbb;
}

.highlight .sr {
	color: olive;
}

[hidden],
.button span {
	display: none;
}

b,
strong,
.highlight .k,
.highlight .o,
.highlight .gs,
.highlight .kc,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .ow {
	font-weight: 700;
}

dfn,
.highlight .ge {
	font-style: italic;
}

.meta span,
.meta .source {
	vertical-align: middle;
}

.meta .avatar,
.comment-meta .avatar {
	width: 20px;
	height: 20px;
	border-radius: 2px;
	margin-right: 5px;
}

.meta .bio,
.highlight .gh,
.highlight .bp {
	color: #999;
}

.night .comment-meta .author,
.night .content,
.night .meta .author,
.highlight .go {
	color: #888;
}

.night .headline-title,
.night .headline-background .heading-content,
.night .question-title {
	color: #B8B8B8;
}

.highlight .c,
.highlight .cm,
.highlight .c1 {
	color: #998;
	font-style: italic;
}

.highlight .gr,
.highlight .gt {
	color: #a00;
}

.highlight .gp,
.highlight .nn {
	color: #555;
}

.highlight .kt,
.highlight .nc {
	color: #458;
	font-weight: 700;
}

.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .il {
	color: #099;
}

.highlight .s,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .s2,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .s1,
.highlight .ss {
	color: #d32;
}

.highlight .na,
.highlight .nb,
.highlight .no,
.highlight .nv,
.highlight .vc,
.highlight .vg,
.highlight .vi {
	color: teal;
}

.highlight .ne,
.highlight .nf {
	color: #900;
	font-weight: 700;
}

.answer h1,
.answer h2,
.answer h3,
.answer h4,
.answer h5 {
	font-size: 19px;
}

@media only screen and (-webkit-min-device-pixel-ratio2),
only screen and (min-device-pixel-ratio2) {
	.icon-arrow-right {
		background-image: url(http://static.daily.zhihu.com/img/share-icons@2x.png);
		-webkit-background-size: 82px 55px;
		background-size: 82px 55px;
	}
	.icon-vote,
	.icon-voted {
		background-image: url(http://static.daily.zhihu.com/img/app/Comment_Vote@2x.png) !important;
		background-size: 11px 12px;
	}
	.icon-voted {
		background-image: url(http://static.daily.zhihu.com/img/app/Comment_Voted@2x.png) !important;
	}
	.night .icon-vote {
		background-image: url(http://static.daily.zhihu.com/img/app/Dark_Comment_Vote@2x.png) !important;
	}
	.from-column {
		background-image: url(http://static.daily.zhihu.com/img/News_Column_Entrance@2x.png) !important;
		background-size: 280px 30px;
	}
	.from-column:active {
		background-image: url(http://static.daily.zhihu.com/img/News_Column_Entrance_Highlight@2x.png) !important;
	}
	.night .from-column {
		color: #2b82ac;
		background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance@2x.png) !important;
	}
	.night .from-column:active {
		background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance_Highlight@2x.png) !important;
	}
}

.meta .meta-item {
	width: 39%;
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	display: inline-block;
	color: #929292;
	margin-right: 7px;
}

.headline .meta {
	white-space: nowrap;
	text-overflow: ellipsis;
	overflow: hidden;
	font-size: 11px;
	color: #b8b8b8;
	margin: 20px 0;
	padding: 0 20px;
}

.headline .meta a,
.headline .meta a:hover {
	margin-top: 2px;
	float: right;
	font-size: 11px;
	color: #0066cf;
	text-decoration: none;
}

.answer h1,
.answer h2,
.answer h3,
.answer h4,
.answer h5 {
	font-size: 19px;
}

.origin-source,
a.origin-source:link {
	display: block;
	margin: 25px 0;
	height: 50px;
	overflow: hidden;
	background: #f0f0f0;
	color: #888;
	position: relative;
	-webkit-touch-callout: none;
}

.origin-source .source-logo,
a.origin-source:link .source-logo {
	float: left;
	width: 50px;
	height: 50px;
	margin-right: 10px;
}

.origin-source .text,
a.origin-source:link .text {
	line-height: 50px;
	height: 50px;
	font-size: 13px;
}

.origin-source.with-link .text {
	color: #333;
}

.origin-source.with-link:after {
	display: block;
	position: absolute;
	border-color: transparent transparent transparent #f0f0f0;
	border-width: 7px;
	border-style: solid;
	height: 0;
	width: 0;
	top: 18px;
	right: 4px;
	line-height: 0;
	content: "";
}

.origin-source.with-link:before {
	display: block;
	height: 0;
	width: 0;
	position: absolute;
	top: 18px;
	right: 3px;
	border-color: transparent transparent transparent #000;
	border-width: 7px;
	border-style: solid;
	line-height: 0;
	content: "";
}

.origin-source-wrap {
	position: relative;
	background: #f0f0f0;
}

.origin-source-wrap .focus-link {
	position: absolute;
	right: 0;
	top: 0;
	width: 45px;
	color: #00a2ed;
	height: 50px;
	display: none;
	text-align: center;
	font-size: 12px;
	-webkit-touch-callout: none;
}

.origin-source-wrap .focus-link .btn-label {
	text-align: center;
	display: block;
	margin-top: 8px;
	border-left: solid 1px #ccc;
	height: 34px;
	line-height: 34px;
}

.origin-source-wrap.unfocused .focus-link {
	display: block;
}

.origin-source-wrap.unfocused .origin-source:before,
.origin-source-wrap.unfocused .origin-source:after {
	display: none;
}

.night .origin-source-wrap {
	background: #292929;
}

.night .origin-source-wrap .focus-link {
	color: #116f9e;
}

.night .origin-source-wrap .btn-label {
	border-left: solid 1px #3f3f3f;
}

.night .origin-source,
.night .origin-source.with-link {
	background: #292929;
	color: #666;
}

.night .origin-source .text,
.night .origin-source.with-link .text {
	color: #666;
}

.night .origin-source.with-link:after {
	border-color: transparent transparent transparent #292929;
}

.night .origin-source.with-link:before {
	border-color: transparent transparent transparent #666;
}


/* ==== */

.question-title {
	color: #494b4d;
}

blockquote {
	color: #9da3a6;
	border-left: 3px solid #Dfe3e6;
}

.content a {
	color: #4786b3;
}

.content {
	font-size: 17px;
	color: #616466;
}

.content-wrap {
	background: #fff;
}

hr {
	margin: 30px 0;
	border-top-width: 0;
}

p {
	margin: 20px 0 !important;
}

.dudu-night .content {
	color: #797b80;
}

.dudu-night hr {
	color: #27282b;
	border-color: #27282b;
}

.dudu-night .meta .author,
.dudu-night .meta .bio {
	color: #555659;
}

.dudu-night .headline-title,
.dudu-night .headline-background .heading-content,
.dudu-night .question-title {
	color: #919499;
}

.dudu-night .headline {
	border-bottom: none;
}

.dudu-night img {
	-webkit-mask-image: -webkit-gradient(linear, 0 0, 0 100%, from(rgba(0, 0, 0, 0.7)), to(rgba(0, 0, 0, 0.7)));
}

body.dudu-night,
.dudu-night .content-wrap {
	background: #1d1e1f;
}

.dudu-night .answer+.answer {
	border-top: 2px solid #27282b;
}

.dudu-night .question+.question {
	border-top: 4px solid #27282b;
}

.dudu-night .view-more a {
	background: #1d1e1f;
	color: #396280;
}

.dudu-night .icon-arrow-right {
	background-image: url(http://static.daily.zhihu.com/img/share-icons.png);
	background-repeat: no-repeat;
	display: inline-block;
	vertical-align: middle;
	background-position: -70px -35px;
	width: 10px;
	height: 15px;
}

.dudu-night blockquote,
.dudu-night sup {
	border-left: 3px solid #2e3033;
	color: #555659;
}

.dudu-night .content a {
	color: #396280;
}

.dudu-night img {
	opacity: 0.7;
}

.dudu-night .from-column {
	color: #2b82ac;
	background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance.png);
}

.dudu-night .from-column:active {
	background-image: url(http://static.daily.zhihu.com/img/Dark_News_Column_Entrance_Highlight.png);
}

//绂佺敤澶撮儴涓嬮潰鐨勫垎闅旂嚎
.dudu .headline {
	border-bottom: none;
}

.dudu-night .origin-source,
.dudu-night a.origin-source:link {
	background: #222324;
}

.dudu-night .origin-source.with-link .text {
	color: #797b80;
}

.dudu-night .origin-source.with-link:after {
	border-color: transparent transparent transparent #797b80;
}